Standardize TIF extensions #71
Description
This is part bug, part standardization, and part feature request. Right now preview doesn't work with TIF extensions. We also use two different lists for deciding if an imagery source should be handled differently. Finally, we should add .vrt to this list because we can read from Virtual Rasters just like GeoTIFF.
My recommended approach would be adding a list or function in utils.py and import that in other scripts.